As a rough guide, a fully welded chassis using 2mm walled steel with the basic CP plates fitted will be approx 70kgs in total, give or take a few kgs depending how much you have welded onto the main frame of the chassis( if you have fitted diff plate hangers/wishbone brackets etc).
Chris...just be aware that when using the MX5 as the donor there are a few parts of the chassis that are longer than book spec, its not alot, approx 0.5mtr, this is basically to accommodate the new diff cage arrangement. The overall dimensions of the length/ width of the chassis etc are the same as book spec details.
cheers
andy
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